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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* tar.h
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#ifndef TAR_H
#define TAR_H
#include "config.h"
#include "util.h"
#include <stdbool.h>
#include <stdint.h>
typedef struct sparse_map_t {
struct sparse_map_t *next;
sqfs_u64 offset;
sqfs_u64 count;
} sparse_map_t;
typedef struct {
char name[100];
char mode[8];
char uid[8];
char gid[8];
char size[12];
char mtime[12];
char chksum[8];
char typeflag;
char linkname[100];
char magic[6];
char version[2];
char uname[32];
char gname[32];
char devmajor[8];
char devminor[8];
union {
struct {
char prefix[155];
char padding[12];
} posix;
struct {
char atime[12];
char ctime[12];
char offset[12];
char deprecated[4];
char unused;
struct {
char offset[12];
char numbytes[12];
} sparse[4];
char isextended;
char realsize[12];
char padding[17];
} gnu;
} tail;
} tar_header_t;
typedef struct {
struct {
char offset[12];
char numbytes[12];
} sparse[21];
char isextended;
char padding[7];
} gnu_sparse_t;
typedef struct tar_xattr_t {
struct tar_xattr_t *next;
char *key;
char *value;
char data[];
} tar_xattr_t;
typedef struct {
struct stat sb;
char *name;
char *link_target;
sparse_map_t *sparse;
sqfs_u64 actual_size;
sqfs_u64 record_size;
bool unknown_record;
tar_xattr_t *xattr;
/* broken out since struct stat could contain
32 bit values on 32 bit systems. */
sqfs_s64 mtime;
} tar_header_decoded_t;
#define TAR_TYPE_FILE '0'
#define TAR_TYPE_LINK '1'
#define TAR_TYPE_SLINK '2'
#define TAR_TYPE_CHARDEV '3'
#define TAR_TYPE_BLOCKDEV '4'
#define TAR_TYPE_DIR '5'
#define TAR_TYPE_FIFO '6'
#define TAR_TYPE_GNU_SLINK 'K'
#define TAR_TYPE_GNU_PATH 'L'
#define TAR_TYPE_GNU_SPARSE 'S'
#define TAR_TYPE_PAX 'x'
#define TAR_MAGIC "ustar"
#define TAR_VERSION "00"
#define TAR_MAGIC_OLD "ustar "
#define TAR_VERSION_OLD " "
#define TAR_RECORD_SIZE (512)
/*
Returns < 0 on failure, > 0 if cannot encode, 0 on success.
Prints error/warning messages to stderr.
The counter is an incremental record counter used if additional
headers need to be generated.
*/
int write_tar_header(int fd, const struct stat *sb, const char *name,
const char *slink_target, const tar_xattr_t *xattr,
unsigned int counter);
/* calcuate and skip the zero padding */
int skip_padding(int fd, sqfs_u64 size);
/* round up to block size and skip the entire entry */
int skip_entry(int fd, sqfs_u64 size);
int read_header(int fd, tar_header_decoded_t *out);
void clear_header(tar_header_decoded_t *hdr);
/*
Write zero bytes to an output file to padd it to the tar record size.
Returns 0 on success. On failure, prints error message to stderr.
*/
int padd_file(int outfd, sqfs_u64 size);
/*
A wrapper around the read() system call. It retries the read if it is
interrupted by a signal or less than the desired size was read. Returns 0
on success. Writes to stderr on failure using 'errstr' as a perror style
error prefix.
*/
int read_retry(const char *errstr, int fd, void *buffer, size_t size);
#endif /* TAR_H */
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